This is the Speed Tuned 21XZ-B Speed Spec II ABC 1/8 scale Buggy Engine
from O.S. Engines.
******Because of the expressed racing nature of this engine,******
******it is NOT covered by the O.S. 2 Year Warranty******
******per page 1 of manual.******

Carburetor Settings, NOTE carburetor is preset at factory and
requires very small adjustments Needle Valve: Approximately 3.5 turns open from fully closed Throttle: Approximately 0.5mm open from factory setting with
reducer removed Metering Needle: Rotate until slotted head is 1.5mm away from ball
link body Mixture Control Valve: Rotate until slotted head is flush with
carb body